Mandible

Mentum

Mentum with 2 long median teeth and 4 pairs of much shorter lateral teeth present. Ventromental plate not visible. Seta submenti arising close to mentum.

Maxilla

Maxilla with palpiger with long simple or apically branched chaetulae. Galea without lamellae or pecten galearis. Setae maxillaris simple.

Body

Body with parapods separate, each with an apical crown of claws. Procercus about as long as wide, bearing 6 anal setae. Anal tubules subglobular; dorsal pair lying on lateral surface of bases of posterior parapods. Lateral margin of abdominal segments, except last 2 segments, with row of setal tufts.

Notes

Ecological Notes

Xylotopus larvae mine in partly decomposed wood submerged in shallow, standing water or in the slower reaches of of flowing water.

One species is known from the Nearctic and another undescribed one from northern Burma.